The transition from individual gestation stalls to group housing for pregnant sows is one of the most significant ongoing changes in pig welfare.
The gestation stall transition represents one of the largest managed welfare improvements in the history of animal agriculture. Millions of sows that previously spent months in immobilizing confinement now have the ability to move, socialize, and engage in natural behaviors during pregnancy. The welfare improvement is not unambiguous — group housing introduces social aggression risks that must be managed — but the consensus is clear that the fundamental behavioral freedom of group housing represents a better welfare outcome than immobilizing confinement. The transition has demonstrated that animal welfare improvements can be implemented at industry scale without destroying the economics of production, providing a template for future reform.